CheckingIf you click 'Check' the system will check for incorrect squares. If 'Show mistakes when checking' is checked they will be marked in red. The system only checks squares that contain one large A, B C, or X, and ignores all others. If 'Highlight clues' is checked any clue where A, B or C appears first in the row/column will be highlighted - this does not mean that your answer is correct.

UniquenessEach puzzle has exactly one solution, which can be found using logic alone and no guesses are ever required. If you think you've found another solution, then please double check the rules.

JavaScriptThis game requires JavaScript to be enabled.

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